Abstract
This paper offers a short survey of linear systems Proportional-Integral-Observer design. This observer has the capacity
to estimate simultaneously the states and unknown inputs which include disturbances or model uncertainties appearing
on the system. The design of state and output estimation using PO and state, output and disturbance estimation using
PIO is done using Matlab/Simulink successfully. The simulation is done for estimating using PO and PIO and the
results proved that estimates the state variables and output correctly when there is no disturbance in the plant and there
is a constant steady-state error in estimation after leading a constant disturbance into the plant for both state variables
and plant output for the Proportional Observer and there is ability to estimate state variables, disturbance and system
output correctly with or without the disturbance in plant for the Proportional Integral Observer.
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